Manlet c



(No Model.)

M. G. LAWTON.

DREDGER DIPPER.

Patented Apr. 17', 1888. 8

N, PETERS, Pholc-hlhugnphgr, Washington, D. c

UNITED STATES PATENT om-ca: I

MANLEY o. 'VLAWTON, OF STATEN; ISLAND, CALIFORNIA.

.DREDGER-DVIPPEFVL SPECIFICATION forming tarts; Letters Patent as.381,258, dated Aprill'l, 188a. v j I i Application filed February 8,1888. Serial No. 263,421. (Ho model.) I

To all whom it may concern:

Be it'known that I, MANLEY C. LAWTON, of Staten Island,j.San Joaquincounty, State of Oallfornia, have invented an Improvement inDredger-Dippers; and I hereby declare the followingto be a full, clear,and exact description of the same. I p My invention relates to thatclass of dredger dippers or buckets whichare commonly known asclam-shell, and which employ two. opposing pivoted jaws, with mechanismforrforcing them together and releasing them.

My invention'consists, in connection with the jaws, of thecrossinglinks, the sliding cross-heads, and a sliding or varying connectionbetween the links andthecross-heads, as I shall hereinafter fullydescribe.

The object of my invention is -to increase the power in closing the jawsand to apply this increase in the best manner.

Referring to the accompanying drawings, Figure 1 is an elevation of mydipper. Fig. 2 is a side elevation.

V I A represents slotted guide frames of the dipz 5 per,'toa bracket, a,on the lower end of which .arepivoted,atb,theopposingjawsB. Mounted inthe lower part of the frame is a rotary shaft, 0, on the center of whichis a sheave, D, and) on each side of which are sheaves E, of smallersheave, and two chains, 6, are secured to'each of the smallersheaves,the chains on the smaller sheave being wound in a directionopposite to the chain on the larger sheave. Mounted in the slottedguides and adapted to move up and down therein are the blocks 6', whichcarry the cross-shaft 0, having a bail or yoke-frame,

e with lifting-chain e; attached. Secured to the cross-shaft on eachside is across-head, G, each of which is longitudinally slotted.

Secured to the frame A on each side are the guide-brackets H, which areprovided with slots h, said slots at their outer ends'being diameter. Achain, d, is secured to the larger.

these pinsor studsf, and the end-of theuother chain on the sameside isattached to the other I pin or'stud, the two chainsic on the othersidebeing similarlyattached. v

The operation is'as follows: When the bucket has been lowered down in anopen position to the bed of material in which itis to operate, the chaind is drawn up, soas to rotate-the 6e sheave D, and through saidsheave'and the shaft 0 to rotate the sheaves E, wherebyrthey wind uptheir chains 6, thus pulling down upon:

the links E. This causes said links to move downwardly, their pins orstuds f moving downwardlyin the slots of the brackets H and inwardly inthe slots of the sliding cross-heads G until" they reach their limit,when the jaws are closed. To open the dipper again, when I .hoisted bychainkz, the-chain d is slacked up,

so that the jaws are relieved. By this construction I gain a greaterpower of closing the jaws, due to the increased leverage of the lin ks.

This leverage is the greatest when the connection of the'link andcross-head is at the outer.

limits, and on account of the vertical portion of the slots h thegreatest leverage is maintainedfor a short time at the beginning of theoperation, sothat the jaws'are-enabledto dig into the materialwithsufficient power.

A further advantage inpower is gained by the sliding or varyingconnection betweenthe link and crossheads, as I am'enabled by-the'connection of the chains e toexert their in the line of resistance. v 7

Another advantage ofthe sliding connection between the links and thecross-heads is that power said links may be shorter than they would.

have tobe if they wereattached permanently at the outer ends of'thecrossheads. i gq Having thus described my invention, what I claim asnew, and desire to secure by Letters Patent, is;-

' 1.v In a vdredger-dippenthe pivoted oppos ing jaws, in combinationwith the crossing links attached to said jaws, thesliding crossheads,and a sliding orvarying connection be-- tween said cross-heads and theupper endsof the links, substantiallyas herein described.

2. In a dredger-dipper, the pivoted oppos ing jaws, in combination withthe 'crossing' fl links attached to said jaws, the slidinglongitudinally-slotted cross-heads, and pins or studs I by which theupperends ofthe links are con- I nected with and slide in the slottedcrossheads, substantially as herein described.

3. In a dredger-dipper, the pivoted opposing 'jaws, in combination withthe crossing links attached to said jaws, the slidinglongitudinally-slotted cross-heads, the fixed slotted guide-brackets,and pins or studs in the upper ends of the links and passing through theslots in the guide-brackets and in the cross-heads, substantially asherein described.

4. In a dredger-dipper, the pivoted opposing jaws, in combination withthe crossing links attached to said jaws, the slidinglongitudinally-slotted cross-heads, the fixed guidebrackets having slotswith approximately vertical outer endsand thence curving inwardly, andpins or studs in the upper ends of the links and passing through theslots in the guide-brackets and in the cross-heads, substantially asherein described.

5. In a dredger-dipper, the pivoted opposing jaws, the slidingcross-shaft with its liftingchain, the rotary shaft having the largesheave with chain (1, and the smaller sheaves with chains e, incombination with the crossing links attached to the jaws,'the slidingslotted cross-heads carried by the cross shaft, and the pins or studs inthe tops of the links, and with which the chains e are connected, saidpins or studs passing through the slotted cross-heads, substantially asherein described.

6. In a dredger-dipper, the combination of the pivoted opposing jaws,the sliding crossshaft with its lifting-chain, the crossing links bywhich the jaws are operated, the sliding slotted cross-heads carried bythe cross-shaft,

MANL'EY c. LAWTON.

Witnesses:

S. H. NoURsE, H. .0. LEE.

